WO2009038239A1 - 高分子電解質組成物 - Google Patents
高分子電解質組成物 Download PDFInfo
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- WO2009038239A1 WO2009038239A1 PCT/JP2008/067594 JP2008067594W WO2009038239A1 WO 2009038239 A1 WO2009038239 A1 WO 2009038239A1 JP 2008067594 W JP2008067594 W JP 2008067594W WO 2009038239 A1 WO2009038239 A1 WO 2009038239A1
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- C08L87/00—Compositions of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
- C08L87/005—Block or graft polymers not provided for in groups C08L1/00 - C08L85/04
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- C08G10/00—Condensation polymers of aldehydes or ketones with aromatic hydrocarbons or halogenated aromatic hydrocarbons only
- C08G10/02—Condensation polymers of aldehydes or ketones with aromatic hydrocarbons or halogenated aromatic hydrocarbons only of aldehydes
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
- C08G65/4012—Other compound (II) containing a ketone group, e.g. X-Ar-C(=O)-Ar-X for polyetherketones
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- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
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- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/10—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with phenol
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- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/12—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with monohydric phenols having only one hydrocarbon substituent ortho on para to the OH group, e.g. p-tert.-butyl phenol
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- C08J5/20—Manufacture of shaped structures of ion-exchange resins
- C08J5/22—Films, membranes or diaphragms
- C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
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- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
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- C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- C08L81/06—Polysulfones; Polyethersulfones
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
- H01B1/122—Ionic conductors
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/102—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer
- H01M8/1025—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer having only carbon and oxygen, e.g. polyethers, sulfonated polyetheretherketones [S-PEEK], sulfonated polysaccharides, sulfonated celluloses or sulfonated polyesters
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- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/102—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer
- H01M8/1027—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer having carbon, oxygen and other atoms, e.g. sulfonated polyethersulfones [S-PES]
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- H01M8/00—Fuel cells; Manufacture thereof
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- H01M8/102—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer
- H01M8/1032—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer having sulfur, e.g. sulfonated-polyethersulfones [S-PES]
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- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
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- H01M8/1039—Polymeric electrolyte materials halogenated, e.g. sulfonated polyvinylidene fluorides
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- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
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- H01M8/1069—Polymeric electrolyte materials characterised by the manufacturing processes
- H01M8/1072—Polymeric electrolyte materials characterised by the manufacturing processes by chemical reactions, e.g. insitu polymerisation or insitu crosslinking
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- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
- C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
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Definitions
- the present invention relates to a polymer electrolyte composition. More particularly, the present invention relates to a polymer electrolyte composition suitable for obtaining a member of a solid polymer fuel cell.
- a polymer electrolyte fuel cell (hereinafter abbreviated as “fuel cell”) is a power generation device that generates electricity through a chemical reaction between hydrogen and oxygen, and is one of the next-generation energy industries. It is highly expected in fields such as the automobile industry.
- hydrocarbon polymer electrolytes that are inexpensive and have excellent heat resistance have attracted attention as polymer electrolyte membranes for fuel cells, instead of conventional fluorine-based polymer electrolytes.
- '' Use a polymer electrolyte that can form a polymer electrolyte membrane in which a polymer segment having an ion conductive component and a polymer segment not having an ion conductive component are microphase-separated as a hydrocarbon polymer electrolyte.
- the polymer segment having an ion conductive component forms a good ion conduction path, and has excellent performance as a member for a fuel cell such as exhibiting excellent ion conductivity. Therefore, various developments of such hydrocarbon polymer electrolytes have been studied so far (for example, Japanese Patent Laid-Open Publication No. 2000-0 3 1 2 3 2 (Claims) and Japanese Patent Laid-Open Publication No. 2007-097). 1 7 7 1 9 7 (Claims), and Japanese Patent Laid-Open Publication No. 2 0 3-1 1 3 1 3 6 (Claims)).
- a membrane made of a hydrocarbon polymer electrolyte has a lower long-term operational stability of a fuel cell (hereinafter referred to as “long-term stability”) than a membrane made of a fluorine-based polymer electrolyte. It has been pointed out. Key points that hinder this long-term stability Various factors have been estimated as one of the causes. One of them is the deterioration of the membrane caused by peroxides generated during operation of the fuel cell (for example, hydrogen peroxide) or radicals generated from the peroxides. Are known. Therefore, improving the durability of the polymer electrolyte membrane against peroxides and radicals (hereinafter referred to as “radical resistance”) is considered to be one measure that leads to the long-term stability of polymer electrolyte fuel cells. ing.
- antioxidants such as hindered phenolic antioxidants have been widely used for the purpose of suppressing melting deterioration during processing and oxidative deterioration that occurs over time.
- antioxidants such as hindered phenolic antioxidants
- characteristics as a fuel cell such as power generation performance may be deteriorated. Therefore, there has been a strong demand for the realization of a polymer electrolyte membrane with excellent long-term stability while maintaining practically sufficient power generation characteristics. Disclosure of the invention
- an object of the present invention is to provide a polymer electrolyte membrane that exhibits good radical resistance while having ion conductivity that can express practically sufficient power generation characteristics, and the polymer electrolyte. It is an object of the present invention to provide a polymer electrolyte composition capable of obtaining a membrane. Furthermore, another object of the present invention is to provide a polymer electrolyte fuel cell that uses the polymer electrolyte membrane and has excellent long-term stability.
- the polymer electrolyte composition is a condensate of a phenol with at least one selected from the group consisting of phenol, cresol and xylenol and an aldehyde compound.
- Component (A) 1 As a segment having an ion exchange group, the main chain of the segment may have an aromatic ring, and may further have a side chain having an aromatic ring.
- a r ′ to A r 9 independently of each other have an aromatic ring in the main chain, and may further have an aromatic ring as a side chain. At least one of the aromatic ring of the main chain or the aromatic ring of the side chain has an ion exchange group directly bonded to the aromatic ring.
- Z and Z ′ each independently represents CO or SO 2
- X, X ′ and X ′′ each independently represent 0 or S.
- Y represents a direct bond or the following formula
- R a and R b are independently of each other a hydrogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, and an optionally substituted carbon number 1 to An alkoxy group having 10 carbon atoms, an aryl group having 6 to 18 carbon atoms that may have a substituent, an aryloxy group having 6 to 18 carbon atoms that may have a substituent, or a substituent; Represents an optionally substituted acyl group having 2 to 20 carbon atoms, and R a and R b may be linked to form a ring.
- n represents an integer of 5 or more.
- Ar to Ar 19 each independently have an aromatic ring in the main chain, and may further have an aromatic ring as a side chain.
- Z, Z, each independently represents CO, so 2 ;
- X, X, and X each independently represent 0, S.
- Y is a direct bond or Represents a group represented by the following general formula (1 c), p ′ represents 0, 1 or 2, q ′ and r ′ represent 1, 2 or 3 independently of each other.
- polymer electrolyte composition according to any one of [1] to [8], wherein the polymer electrolyte has a segment substantially free of an ion exchange group represented by
- R a and R b are independently of each other a hydrogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, and an optionally substituted carbon number 1 to An alkoxy group having 10 carbon atoms, an aryl group having 6 to 18 carbon atoms that may have a substituent, an aryloxy group having 6 to 18 carbon atoms that may have a substituent, or a substituent; Represents an optionally substituted acyl group having 2 to 20 carbon atoms, and R a and R b may be linked to form a ring.
- the present invention also provides the following [11:] to [16] using any of the polymer electrolyte compositions described above.
- a polymer electrolyte membrane comprising the polymer electrolyte composition according to any one of [1] to [10].
- the density of the segment having an ion exchange group is higher than the density of the segment having substantially no ion exchange group, and the density of the segment ⁇ having substantially no ion exchange group [11]
- the polymer electrolyte membrane according to [11] which has a microphase separation structure including a phase higher than the density of the segmented soot.
- [1 3] A membrane-one-electrode assembly comprising the polymer electrolyte membrane according to [1 1].
- a catalyst layer comprising the polymer electrolyte composition according to any one of [1] to [10].
- a membrane-one electrode assembly comprising the catalyst layer of [1 4].
- Component (B) is a condensate of phenols and aldehyde compounds as described above.
- a phenol means a compound in which 1 to 3 phenolic hydroxyl groups are bonded to a benzene ring or a naphthalene ring, and the phenol has an aromatic ring having 1 to 1 carbon atoms. It may have a 6 alkyl group or an aryl group having 6 to 10 carbon atoms as a substituent.
- Examples include resonoresin, 2-methinoresole ⁇ syn, hydroquinone, 2-methinorehydrodroquinone, t rt —Putinorehydrodroquinone, phlorogzoresinonor, naphthalene 1,2,6-diol, and the like.
- phenols having only one reaction point with the aldehyde compound can be used for producing the condensate.
- the condensation reaction can be stopped at this end.
- examples of phenols having only one reaction point include 2,6-xylenol, 2,4-xylenol, 2,3,4-trimethylphenol, and the like.
- the phenols derived from the condensate of component (B) include phenols selected from the group consisting of phenol, o-cresol, m-cresol, and p-cresol. preferable.
- the production of the condensate is relatively easy.
- the resulting condensate has a so-called hint of a phenolic hydroxyl group. It has almost no dad functionality.
- hindered is a term representing the geometrical properties of a molecule, and a hindered functional group is a bulky group (benzene) bonded to a carbon atom adjacent to a carbon atom bonded to a phenolic hydroxyl group.
- phenols having a hydroxyl group bonded to the ring means a bulky group bonded to the o-position with respect to the phenolic hydroxyl group.
- the bulky group typically include a tert-butyl group and a cyclohexyl group.
- the hindered functional group may be used as long as the progress of the condensation reaction for obtaining the condensate is extremely hindered or the radical resistance of the fuel cell member such as a polymer electrolyte membrane described later is not significantly impaired. It is also possible to use phenols having the above for producing the condensate. In this case, the total amount of phenols having hindered functional groups is 20 moles with respect to the total of phenols used in the production of the condensate. /. The following is preferable, and it is further more preferable that it is 10 mol% or less.
- the aldehyde compound means a compound having one CHO group in the molecule. Specifically, formaldehyde, acetate aldehyde, propanal, butanal, hexanal, otatanal, decanal, dodecanal, hexadecanal, icosanal, 2-methylpropanal, 2-methylbutanal, 2-ethylbutanal, 2, 2 —Dimethylpropanal, acrolein, 2-butenal, 2_hexenol, 2-octenal, acetylene aldehyde, 2-butynal, 2-hexynal, 2-octynal, cycloheptylcal
- Examples include aliphatic aldehydes such as balaldehyde, cyclohexylcarbaldehyde, benzaldehyde, 1-naphthylaldehyde, 2_naphthylaldehyde, s
- aldehyde compound used for the production of the condensate a high molecular compound capable of generating an aldehyde compound by depolymerization can be used, and the aldehyde group can be acetal group or hemiacetal. Those protected with a group can also be used.
- aldehyde compounds may be used alone or in combination of two or more for the production of the condensate.
- Preferred aldehyde compounds are formaldehyde and / or acetate aldehyde, and particularly preferred is formaldehyde.
- the phenols are linked by a methylene group (one CH 2 _).
- a hindered functional group is not generated.
- paraformaldehyde (formaldehyde precursor) that depolymerizes to form formaldehyde can be used, or formalin, which is an aqueous solution of formaldehyde, can also be used.
- formalin which is an aqueous solution of formaldehyde
- a condensate of component (B) By condensing one or more of the phenols with one or more of the aldehyde compounds, a condensate of component (B) can be obtained.
- the reaction conditions relating to the condensation reaction between the phenols and the aldehyde compound are not particularly limited, and can be optimized as appropriate depending on the type of raw materials used.
- a typical condensation reaction can be carried out by using an acid catalyst, a metal salt catalyst or an alkali catalyst in the presence or absence of a reaction solvent.
- the reaction temperature is 0 to 200 ° C., preferably 50 to 150 ° C., more preferably 60 to 120 ° C.
- the reaction time is 0.1 to 30 hours, preferably 1 to 20 hours.
- the acid catalyst examples include inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid, and phosphoric acid, and organic acids such as acetic acid, oxalic acid, malonic acid, and toluenesulfonic acid.
- the metal salt catalyst examples include magnesium acetate and zinc acetate.
- the alkali catalyst includes sodium hydroxide, water oxidizing power, sodium hydroxide, cesium hydroxide, sodium carbonate, sodium hydrogen carbonate, Ammonia, tetramethylammonium hydroxide, triethylamine, morpholine, pyridine and the like.
- the amount of such a catalyst used is preferably 0.1 to 50% by weight, more preferably 0.5 to 30% by weight, based on the total weight of the phenols.
- reaction solvent used in the condensation reaction examples include alcohols such as methanol, ethanol, isopropanol, and tert-butyl alcohol; ketones such as methyl ethyl ketone, 2-butanone, methyl isobutyl ketone, 2-heptanone, and cyclohexanone.
- Esters such as propyl acetate, butyl acetate, isobutyl acetate, methyl propionate, ethyl lactate, propylene glycol acetate; ethers such as dibutyl ether, tetrahydrofuran, tetrahydropyran, dioxane; aroma such as benzene, toluene, xylene Group hydrocarbons; halogenated hydrocarbons such as dichloromethane, black mouth form, carbon tetrachloride, bromoform; hydrocarbons such as hexane, heptane, decane, petroleum ether, etc. Seed or Two or more types can be mixed and used.
- ketones When ketones are used as the reaction solvent, the ketones may react with phenols (side reactions) depending on the reaction conditions of the condensation reaction. Therefore, it is necessary to select reaction conditions so that such side reactions do not occur as much as possible.
- formaldehyde when used as the aldehyde compound, the reactivity of formaldehyde with respect to phenols is extremely higher than that with ketones, so that such side reaction can be avoided.
- water may coexist in the reaction system, and a reaction solvent that is separated into two layers with water and a solvent that is incompatible with water can also be used.
- water may be removed by distillation dehydration or the like.
- the catalyst used in the production of the condensate does not have to be removed from the condensate after production unless there is a particular inconvenience for use as the component (B), but the catalyst may be removed as necessary. You can also.
- the removal of the catalyst involves the condensation reaction. When a solvent that is not mixed with water is used as the reaction solvent, a separation water washing process may be performed.
- reaction solution after the condensation reaction is put into a solvent in which the obtained condensate is insoluble, the condensate is precipitated, the condensate precipitated by solid-liquid separation is taken out, and then the precipitated condensate is removed.
- the catalyst can also be removed by washing with water or the like.
- the condensate used for component (B) is preferably soluble in a solvent.
- the use of fuunols having three reaction points that react with aldehyde compounds phenol, m-cresol, 3,5-xylenol, etc.
- aldehyde compounds phenol, m-cresol, 3,5-xylenol, etc.
- the molecular chain may cause a crosslinking reaction, and the resulting condensate may become insoluble in the solvent.
- such a condensate that is insoluble in the solvent is used as the component (B), it tends to be relatively difficult to form a polymer electrolyte composition to obtain a polymer electrolyte membrane.
- the condensate used for component (B) is soluble in a solvent.
- the condensate is a linear polymer or has a degree of branching that is soluble in the solvent. It is preferably a molecule. Therefore, when using phenols with three reaction points that react with the aldehyde compound, the reaction conditions for the condensation reaction described above are appropriately optimized so that the resulting condensate is soluble in the solvent. It is preferable that The term “soluble in a solvent” as used herein refers to any one of those exemplified as a suitable solvent used for preparing a polymer electrolyte solution in a solution casting method described later at a concentration of 1% by weight or more. It means that it is melted.
- the component (B) used in the present invention is preferably a condensate having a molecular weight of 500 or more, particularly preferably 600 or more. If a low molecular weight molecular weight of the condensate is less than 500 is used as the component (B), when a polymer electrolyte membrane is obtained, a bleed phenomenon occurs and the condensate oozes from the polymer electrolyte membrane. There is a risk of release. Therefore, in the polymer electrolyte membrane, the In order for the condensate to exist stably, the molecular weight of the condensate is preferably 500 or more.
- the condensate is not a single compound but has a molecular weight dispersion
- the number average molecular weight in terms of polystyrene determined by gel permeation chromatography (hereinafter referred to as “GPC”) analysis and the molecular weight is With the elution time corresponding to 500 as a base point, it can be confirmed that there is no component detected with an elution time later than this base point, and the presence or absence of a low molecular weight component in the condensate can be determined.
- the low molecular weight component may be removed by a known means such as reprecipitation purification.
- the upper limit of the molecular weight of the condensate is preferably determined within the range that is soluble in the solvent as described above. From such a viewpoint, the upper limit of the molecular weight is preferably 20.00 or less, and more preferably 10:00 or less.
- More preferred condensates are, as described above, condensates of phenols containing one or more selected from the group consisting of phenol, cresol and xylenol, and aldehyde compounds containing formaldehyde.
- phenol containing one or more selected from the group consisting of phenol, cresol and xylenol, and aldehyde compounds containing formaldehyde.
- formaldehyde examples thereof include condensates produced by replacing part of the aldehyde with benaldehyde and / or acetate aldehyde.
- condensates are used as additives for photoresists, and such known condensates can also be used as component (B).
- the following pentanuclear novolak compound is (In the formula, one of RR 2 , R 3 , R 4 and R 5 represents a hydroxyl group, one of R 6 , R 7 , R 8 , R 9 and R 10 represents a hydroxyl group, RR 2 , R 3 , R 4 , RR 6, R 7 , R 8 , R 9 and the rest of R 1Q independently of each other represent hydrogen, alkyl having 1 to 6 carbon atoms or a hydroxyl group)
- JP-A-9_110758 discloses the following hexanuclear novolak compound.
- one of RR 2 , R 3 , R 4 and R 5 represents a hydroxyl group
- one of R 6 , R 7 , R 8 , R 9 and R 1 ⁇ 5 represents a hydroxyl group
- the molecular weight is 500 or more, and it does not have a hindered functional group for a phenolic hydroxyl group, Those which do not contain impurities which are relatively low molecular weight components are disclosed.
- Such pentanuclear novolak compounds or hexanuclear novolak compounds can be preferably used as the component (B).
- component (B) according to the polymer electrolyte composition of the present invention is as follows:
- component (A) It is selected within a range that exhibits radical resistance without significantly impairing the ionic conductivity of the polymer electrolyte.
- component (A) and component (B) It is more preferable that the component (B) is 0.01 to 25% by weight and the component (B) is 0.5 to 20% by weight based on the total amount.
- Ingredient ratio (S) of component (B) within this range, not only can a fuel cell member exhibit good radical resistance and achieve long-term stability of the fuel cell, but also a high component (A)
- a polymer electrolyte membrane made of a molecular electrolyte is preferred because it does not significantly impair the microphase separation structure described later, and can exhibit good ionic conductivity.
- the polymer electrolyte has a segment having an ion exchange group and a segment having substantially no ion exchange group, and the copolymerization mode thereof is a block copolymer or a graft copolymer. It is a polymer electrolyte that is a polymerization.
- the “segment having an ion exchange group” means a segment containing an average of 0.5 or more ion exchange groups per structural unit constituting the segment. It is more preferable that an average of 1.0 or more per unit is included.
- a segment having substantially no ion exchange group means a segment having an average number of ion exchange groups of 0.1 or less per structural unit constituting the segment. It is more preferable that the average number per structural unit is 0.05 or less, and it is even more preferable that the segment has no ion exchange group.
- a force that is a block copolymer in a form in which a segment having an ion exchange group and a segment having substantially no ion exchange group are covalently bonded.
- the amount of ion exchange groups responsible for ion conductivity is preferably 0.5 meq / g to 4.
- Ome qZg expressed in terms of ion exchange capacity, and 1.0 me qZg to 3. 0 meq no g is more preferred.
- the ion exchange capacity is in such a range, it is preferable because a fuel cell member such as a polymer electrolyte membrane having high ion conductivity and good water resistance can be obtained.
- the polymer electrolyte is preferably an aromatic polymer electrolyte.
- the aromatic polyelectrolyte means that the two segments constituting the polyelectrolyte are both directly bonded by an aromatic group or bonded via an appropriate atom or atomic group. It is a combination.
- typical examples of atoms or atomic groups that connect segments together include a divalent aromatic group, oxygen atom, sulfur atom, carbonyl group, sulfonyl group, or a combination thereof. Valent groups.
- the main chain of the segment may have an aromatic ring, and may further have a side chain having an aromatic ring.
- An ion exchange group is directly bonded to at least one of the aromatic ring of the main chain or the aromatic ring of the side chain.
- an aromatic polymer electrolyte having an ion exchange group directly bonded to the aromatic ring of the main chain is preferable.
- the present applicant has found that an aromatic polymer electrolyte in which an ion exchange group is directly bonded to an aromatic ring exhibits excellent ionic conductivity. 7 1 9 Proposed in Gazette No. 7.
- the ion exchange group may be either a cation exchange group or an anion exchange group, but is preferably a sulfonic acid group (one S 0 3 H), a carboxylic acid group (one CO OH), a phosphoric acid group (_OP (O ) (OH) 2 ), phosphonic acid group (one P (O) (OH).), Sulfonyl imide group (_ S 0 2 — NH— S 0 2 —), etc. Among them, a sulfonic acid group is preferable.
- the cation exchange group of the high molecular electrolyte may be partially or entirely exchanged with a metal ion or the like to form a salt, but it is a member for a fuel cell, particularly a high molecular electrolyte membrane. When used as, it is preferable that substantially all of the cation exchange groups are in a free acid state.
- the polymer electrolyte is preferably a hydrocarbon polymer electrolyte having a halogen atom content of 15% by weight or less in terms of element weight content ratio.
- Such hydrocarbon polymer electrolytes have the advantage of being inexpensive and superior in heat resistance as compared to fluorine polymer electrolytes that have been widely used. More preferred hydrocarbon polymer electrolytes are those that do not substantially contain halogen atoms, and such hydrocarbon polymer electrolytes generate hydrogen halide during fuel cell operation. , advantage that there is little possibility to corrode other members, the mighty s.
- a suitable polymer electrolyte used for the component (A) is a segment having an ion-exchange group represented by the above formula (la), formula (2a), formula (3a), formula ( 4 a) [Hereafter, it may be abbreviated as “Formula (1a) to (4a)”. ], And a segment substantially free of Z or an ion exchange group, the above formula (lb), formula (2 b), formula (3 b), formula (4 b [Hereafter, it may be abbreviated as "Formula (lb) ⁇ (4b)”. ] The polymer electrolyte containing what is represented by either of these is mentioned.
- a r! ⁇ A r 9 in the formula (la) ⁇ (4 a) is to display the divalent aromatic group.
- the divalent aromatic group include bivalent monocyclic aromatic groups such as 1,3-phenylene and 1,4-phenylene, 1,3-naphthalenediyl, 1,4-naphthalenediyl, and the like.
- Divalent condensed fragrances such as ⁇ , 1,5-Naphthalenediyl ⁇ , 1,6-Naphthalenedil, 1,7-Naphthalenedyl, 2,6-Naphthalenedyl, 2,7-Naphthalenedyl
- heteroaromatic groups such as pyridine group, pyridine diyl, quinoxa lindyl, and thiophene diyl.
- a divalent monocyclic aromatic group Like Or a divalent monocyclic aromatic group.
- a i ⁇ A r 9 is an alkyl group having 1 to 10 carbon atoms which may have a substituent, an alkoxy group having 1 to 10 carbon atoms which may have a substituent, An aryl group having 6 to 18 carbon atoms which may have a substituent, an aryl group having 6 to 18 carbon atoms which may have a substituent, or a carbon number which may have a substituent It may be substituted with 2 to '20 acyl groups.
- a r 1 and Z or A r 2 in the structural unit constituting the segment of the formula (la), at least one of A r 1 to A r 3 constituting the segment of the formula (2 a), the formula (3 a A r 7 and / or A r 8 in the structural unit constituting the segment of), and Ar 9 in the structural unit constituting the segment of the formula (4a) include at least one ion in the aromatic ring constituting the main chain.
- the ion exchange group is more preferably a cation exchange group, and more preferably a sulfonic acid group.
- a r M ⁇ A r 19 in the formula (lb) ⁇ (4 b) is to display the divalent aromatic group.
- the divalent aromatic group include bivalent monocyclic aromatic groups such as 1,3-phenylene, 1,4-furylene, 1,3-naphthalenedyl, 1,4— Divalent condensed systems such as naphthalene diyl, 1,5—naphthalene diyl, 1,6—naphthalene diyl, 1, 7 _ naphthalene dinore, 2, 6 _ naphthalene di / le, 2, 7-naphthalene diyl Examples include aromatic groups, heteroaromatic groups such as pyridine diyl, quinoxa lindyl, and thiophen diyl. A divalent monocyclic aromatic group is preferred.
- these divalent aromatic groups may have a substituent, and the description of the substituent is the same as in the case of A r 1 to A r 9 .
- the component (A) polymer electrolyte used in the present invention is either a block copolymer or a graft copolymer as long as a polymer electrolyte membrane having a microphase separation structure described later can be obtained, or These can be used in combination.
- the block copolymer preferable.
- Examples of the combination of segments related to a more preferable block copolymer include those shown in Table 1 below. Among these, ⁇ i>, ku>, ku>, ku> or ⁇ > Is preferable, and ⁇ > is particularly preferable. 1] Block Segment with ion-exchange groups Copolymer segment with substantially no ion-exchange groups
- the number of repeating structural units n in the segment segment substantially not having an ion exchange group represented by any one of n represents an integer of 5 or more. Preferably, it is in the range of 5 to 100, and more preferably in the range of 10 to 500.
- a polyelectrolyte having a number of repetitions within this range is preferable because it has a good balance between ionic conductivity, mechanical strength and Z or water resistance, and has an advantage that each segment itself can be easily produced.
- suitable block copolymers include a segment (segment having an ion exchange group) containing one or more structural units selected from the following structural units having an ion exchange group, and the following: And a block copolymer comprising a segment (a segment substantially free of ion exchange groups) containing one or more structural units selected from structural units having no ion exchange groups. . Both segments may be directly connected to each other, or may be connected with an appropriate atom or atomic group. Examples of the atom or atomic group are as described above.
- the structural unit constituting the segment having an ion exchange group has (4a-1) and / or (4a-2).
- a polymer electrolyte having a segment including such a structural unit, particularly a polymer electrolyte having a segment composed of such a structural unit Excellent ion conductivity can be expressed, and since the segment has a polyarylene structure, chemical stability tends to be relatively good. Then, due to the synergistic effect with the component (B), it becomes possible to produce a fuel cell member having even more excellent radical resistance.
- the molecular weight of the polyelectrolyte is preferably 5,000 to 1,000,000, expressed in terms of polystyrene-reduced number average molecular weight by GPC analysis, and preferably 15,000 to 400,000. Is particularly preferred.
- the polymer electrolyte include block copolymers obtained in conformity with, for example, JP-A Nos. 2005-126 and 84 and 2005-113-9432. Examples include the bookmark copolymer disclosed by the present applicant in 1 7 7 1 9 7 publication.
- the method for producing the polymer electrolyte composition is not particularly limited as long as it can be mixed with the component (A) and the component (B), and the component (A) and the component (B) are solid (powder).
- the body) and the components (A) and (B) may be pasted with an appropriate solvent.
- a fuel cell member such as a polymer electrolyte membrane, which will be described later,
- a method of obtaining a polymer electrolyte composition as a polymer electrolyte solution in which the component (A) and the component (B) are dissolved in a suitable solvent is preferable.
- the polymer electrolyte composition of the present invention may contain a component (additive) other than the component (A) and the component (B).
- additives include plasticizers, stabilizers, release agents and the like used for ordinary polymers, and inorganic or organic fine particles added as a water retention agent.
- the polymer electrolyte composition of the present invention may be in a range that does not significantly impair its ionic conductivity and radical resistance in a fuel cell member produced from the polymer electrolyte composition.
- a polymer other than the component (A) and the component (B) (other polymer) may be included.
- a method for producing a polymer electrolyte membrane from the polymer electrolyte composition of the present invention will be described.
- a method of forming a film using the polymer electrolyte solution is particularly preferably used.
- the component (A) and the component (B) are dissolved in a suitable solvent together with other components added as necessary, such as other polymers, additives, and the like.
- the polymer electrolyte solution is cast-coated on a supporting substrate such as a glass substrate or PET (polyethylene terephthalate) film, and the solvent is removed to remove the polymer electrolyte.
- a polymer electrolyte membrane is manufactured by forming a molecular electrolyte membrane and then removing the support substrate by peeling or the like.
- the solvent used for the preparation of the polymer electrolyte solution is not particularly limited as long as it can dissolve the component (A), the component (B), and other components added as necessary and can be removed thereafter.
- Non-proton polar solvents such as dimethylformamide (DMF), dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), dimethylsulfoxide (DMSO), etc.
- Chlorinated solvents such as dichloromethane, chlorohonolem, 1,2-dichloroethane, black benzene, dichlorobenzene, etc., methanol, ethanol, propanol mononole, etc., ethylene glycol monomethylenoateate, ethyleneglycolone monoethyl
- etherol propylene glycol monomethyl ether
- propylene glycol monoethyl ether Sharp glycol monoalkyl ether is preferably used.
- the condensate soluble in the solvent suitable for component (B) is soluble in any of these solvents.
- the solvents exemplified above can be used alone in the preparation of the polymer electrolyte solution, but two or more solvents can be mixed and used as necessary. Among them, DMSO, DMF, DMAc, NMP, or a mixed solvent composed of two or more selected from these is preferably used because the solubility of the polymer electrolyte is high.
- the thickness of the obtained polymer electrolyte membrane is not particularly limited, but is preferably 5 to 300 ⁇ m and more preferably 10 to 200 ⁇ m in practice. When the thickness is in such a range, a polymer electrolyte membrane having a practical membrane strength is easily obtained, and the membrane resistance itself tends to be small.
- the thickness of the polymer electrolyte membrane can be controlled by the concentration of the polymer electrolyte solution and the coating thickness on the substrate.
- the polymer electrolyte membrane obtained from the polymer electrolyte composition of the present invention has a phase in which the density of a segment having an ion-exchange group is higher than the density of a segment having substantially no ion-exchange group (hereinafter referred to as “hydrophilic”). ) And a phase in which the density of segments having substantially no ion exchange groups is higher than the density of segments having ion exchange groups (hereinafter referred to as “hydrophobic segment phase”). And those having a microphase-separated structure are preferred.
- Such a polymer electrolyte membrane having a microphase separation structure exhibits excellent ionic conductivity and good radical resistance due to the action of the component (B), thereby achieving long-term stability of the fuel cell.
- the polymer electrolyte composition of the present invention can significantly improve the radical resistance of the polymer electrolyte membrane, particularly the radical resistance of the hydrophilic segment phase.
- the microphase-separated structure was observed with a transmission electron microscope (TEM), for example.
- TEM transmission electron microscope
- a hydrophilic segment phase (microdomain) and a hydrophobic segment phase (microdomain) are mixed, and the domain width of each microdomain structure, that is, the identity period is several nm to several 100 nm. It refers to a certain structure. Those having a microdomain structure of 5 nm to 100 nm are preferred.
- the polymer electrolyte membrane has a microphase separation structure. Therefore, the component (A) and It is also possible to optimize the blending amount with the component (B).
- a porous substrate is impregnated with the polymer electrolyte composition in order to further improve strength, flexibility, and durability. By doing so, it is possible to make a composite membrane.
- a known method can be used as the compounding method.
- the porous substrate is not particularly limited as long as it satisfies the above-mentioned purpose of use, and examples thereof include porous membranes, woven fabrics, non-woven fabrics, fibrils, etc., which can be used regardless of their shapes and materials. .
- an aliphatic polymer, an aromatic polymer, or a fluorine-containing polymer is preferable from the viewpoint of heat resistance and the effect of reinforcing physical strength.
- the thickness of the porous substrate is preferably 1 to 100 ⁇ m, more preferably 3 to 30 ⁇ m, and particularly preferably 5 to 20 ⁇ m.
- the pore diameter of the base material is preferably 0.01 to 100 ⁇ , more preferably 0.02 to 10 / ⁇ m, and the porosity of the porous base material is preferably 20 to 9 8%, more preferably 40 to 95%.
- the film thickness of the porous substrate is 1 ⁇ or more, the reinforcing effect will be better if the strength is strengthened after compounding or if the flexibility and durability are added. ) Is less likely to occur.
- the film thickness is 100 ⁇ m or less, the electric resistance is further lowered, and the obtained composite membrane is more excellent as an ion conductive membrane of a polymer electrolyte fuel cell.
- the pore size is 0. ⁇ ⁇ ⁇
- filling of the copolymer of the present invention becomes easier, and when it is l OO / xm or less, the reinforcing effect on the copolymer is further increased.
- the porosity is 20% or more, the resistance of ionic conductivity is smaller, and when it is 98% or less, the strength of the porous substrate itself is increased and the reinforcing effect is further improved. .
- the fuel cell of the present invention is produced by joining a catalyst component and a conductive material as a current collector to both surfaces of a polymer electrolyte membrane (or composite membrane) comprising the polymer electrolyte composition of the present invention. (Manufacture of membrane-one electrode assembly).
- the catalyst component is not particularly limited as long as it can activate the oxidation-reduction reaction with hydrogen or oxygen, and a known one can be used, but platinum fine particles or platinum-based alloy fine particles can be used. It is preferable to use it as a catalyst component. Platinum fine particles or platinum-based alloy fine particles are often used by being supported on particulate or fibrous carbon such as activated carbon or graphite. Also applied to the gas diffusion layer is a paste (catalyst ink) prepared by mixing platinum or a platinum-based alloy supported on a single bond with a solution in which perfluoroalkylsulfonic acid resin is dissolved as an ion conductive component. By drying, a catalyst layer integrated with the gas diffusion layer can be obtained.
- a membrane-electrode assembly for a fuel cell can be obtained.
- a specific method for example, J. ⁇ 1 ectroche m. S oc.: 'E lectrochemical
- a known method such as the method described in Sc. Ience and Technology, 1 98 8, 1 3 5 (9), 2 2 0 9 can be used.
- the catalyst ink is applied to a polymer electrolyte membrane or a polymer electrolyte composite membrane and dried, and a catalyst layer is directly formed on the surface of the membrane to obtain a membrane-electrode assembly for a fuel cell. be able to.
- the polymer electrolyte composition of the present invention can be used as a catalyst ink.
- the gold or platinum alloy supported on carbon may be basified together with the component (A) and the component (B).
- the catalyst layer obtained by using the catalyst ink containing the polymer electrolyte composition of the present invention has a high radical conductivity as well as the above-described polymer electrolyte membrane, and has a good radical resistance. Therefore, it is also suitable as a catalyst layer for fuel cells.
- a known material can also be used for the conductive substance as the current collector, but it is preferable in order to efficiently transport a porous carbon woven fabric, carbon non-woven fabric, or carbon paper.
- the fuel cell provided with the member made of the polymer electrolyte composition of the present invention thus produced can be used in various forms using hydrogen gas, reformed hydrogen gas, and methanol as fuel.
- component (A) referring to the methods described in International Publication No. WO 200 7 No 04 3 2 74 Pan Fret Example 7 and Example 21, Sumika Exel PES 5 200 P (manufactured by Sumitomo Chemical Co., Ltd.) Synthesized using
- a segment having a sulfonic acid group comprising the structural unit represented by
- this polymer electrolyte solution was uniformly spread on a PET substrate. After application, dry at 80 ° C under atmospheric pressure. A polymer electrolyte membrane was obtained on the PET substrate.
- the obtained polymer electrolyte membrane was immersed in 2N sulfuric acid, then thoroughly washed with ion-exchanged water, further dried at room temperature, and then peeled from the PET substrate to obtain polymer electrolyte membrane 1. [Evaluation of radical resistance of polymer electrolyte membrane 1]
- the polymer electrolyte membrane 1 obtained in this way was dissolved in a 3 wt% hydrogen peroxide aqueous solution (aqueous solution for radical resistance test) in which ferrous chloride was dissolved so that the iron ion concentration was 8 ppm.
- the radical resistance was evaluated by immersing in C and measuring the weight change of the film after 2 hours.
- the weight of the polymer electrolyte membrane 1 is measured in advance, and after adhering moisture etc. from the polymer electrolyte membrane 1 after immersion for 2 hours, the weight measurement after immersion Went.
- the weight retention rate was calculated from the weight change thus obtained. As a result, the weight retention rate after the test of the membrane was 47%.
- the weight retention rate (%) is indicated by a value X 100 (%) obtained by dividing the weight of the film after 2 hours by the weight before immersion.
- a novolak resin was produced with reference to the method described in Example (Resin a, paragraph 0 0 8 1) of Japanese Patent No. 3 4 6 6 2 18.
- m_cresol / p-cresol was used at a molar ratio of 40 to 60, and formalin was added to give 0.8 times the total amount of cresol, and the condensation reaction was carried out under reflux. I let it go.
- oxalic acid was used as a catalyst.
- the obtained product is subjected to molecular weight fractionation using methyl isobutyl ketone and n-heptane to remove low molecular weight components, and the number average molecular weight in terms of polystyrene by GPC measurement is 85 500 —Cresol Novola Cooked rosin (condensate 2) was obtained.
- the polymer electrolyte solution was prepared by dissolving so as to be (% by weight). Next, this polymer electrolyte solution was uniformly spread on a PET substrate. After coating, it was dried at normal pressure at 80 ° C. to produce a polymer electrolyte membrane on a PET substrate. The obtained polymer electrolyte membrane was immersed in 2N sulfuric acid, sufficiently washed with ion exchange water, further dried at room temperature, and then peeled from the PET substrate to obtain polymer electrolyte membrane 2.
- the polymer electrolyte membrane 3 thus obtained was evaluated for radical resistance in the same manner as in Example 1 except that the polymer electrolyte membrane 1 was used instead of the polymer electrolyte membrane 1, and the weight was changed from the weight change before and after the immersion in the aqueous solution for radical resistance test. The maintenance rate was determined. As a result, the weight retention rate after the test of the membrane was 14%.
- a novolak resin was produced with reference to the method described in Example (Resin a, paragraph 00 8 1) of Japanese Patent No. 346 6 2 18.
- m_cresol 2,5-xylenol Zte rt —Butylhydroquinone 100/40/10
- phenols in a molar ratio of 0.8 times equivalent to the total amount of phenols Formalin was added and a condensation reaction was performed under reflux.
- oxalic acid was used as a catalyst.
- the obtained product was subjected to molecular weight fractionation using methylisobutyl ketone and n-heptane to remove low molecular weight components, and m-creso having a polystyrene equivalent number average molecular weight of 6600 by GPC measurement.
- One "2,5-xylenol tert-butylhydroquinone novolak resin (condensate 3) was obtained.
- the polymer electrolyte solution was prepared by dissolving so as to be (% by weight). Next, this polymer electrolyte solution was uniformly spread on a PET substrate. After application, it was dried at 80 ° C under atmospheric pressure to produce a polymer electrolyte membrane on a PET substrate. The obtained polymer electrolyte membrane was immersed in 2N sulfuric acid, sufficiently washed with ion-exchanged water, further dried at room temperature, and then peeled off from the PET substrate to obtain polymer electrolyte membrane 4.
- the radical resistance was evaluated in the same manner as in Example 1 except that the polymer electrolyte membrane 4 thus obtained was used instead of the polymer electrolyte membrane 1, and the weight change before and after the immersion in the aqueous solution for radical tolerance test was performed. From this, the weight retention rate was determined. The result As a result, the weight retention rate after the test of the membrane was 58%.
- a novolak resin was produced with reference to the method described in Example (Resin a, paragraph 0 0 8 1) of Japanese Patent No. 3 4 6 6 2 18.
- m_cresol Zp-cresol / 2,5-xylenol te rt —butyl hydroquinone 6 0/4 0/4 0/10 0.8 times equivalent of formalin was added to the total amount, and a condensation reaction was carried out under reflux.
- oxalic acid was used as a catalyst.
- the obtained product is subjected to molecular weight fractionation using methylisobutyl ketone and n-heptane to remove low molecular weight components, and the number average molecular weight in terms of polystyrene by GPC measurement is 8300. Cresol / p-cresonole / 2,5-xylenenole / 1 ert-butinorehydroquinone novolak resin (condensate 4) was obtained.
- a polyelectrolyte solution was prepared by dissolving to 5 weight / 0 ). Next, this polymer electrolyte solution was uniformly spread on a PET substrate. After coating, it was dried at normal pressure at 80 ° C. to produce a polymer electrolyte membrane on the PET substrate.
- the obtained polymer electrolyte membrane was immersed in 2N sulfuric acid, sufficiently washed with ion-exchanged water, further dried at room temperature, and then peeled off from the PET substrate to obtain polymer electrolyte membrane 5. [Evaluation of radical resistance of polymer electrolyte membrane 5]
- the polymer electrolyte membrane 7 thus obtained was evaluated for radical resistance in the same manner as in Example 1 except that the polymer electrolyte membrane 1 was used instead of the polymer electrolyte membrane 1, and the weight was changed from the weight change before and after the immersion in the aqueous solution for radical resistance test. The maintenance rate was determined. As a result, the weight retention rate after the test of the membrane was 12%. Comparative Example 3
- the hindered phenol C yanoxl 7 90 (manufactured by Ciba Specialty Chemicals, structural formula is shown below) and the block copolymer 1 used in Production Example 1 were added to DMSO at about 8.5% by weight.
- Concentration [weight ratio of block copolymer 1 / C yanoxl 7 90 9 5 wt% 5 wt. / 0 ] to prepare a polyelectrolyte solution.
- this polymer electrolyte solution was uniformly spread on a PET substrate. After application, it was dried at 80 ° C under atmospheric pressure to produce a polymer electrolyte membrane on the PET substrate.
- the obtained polymer electrolyte membrane was immersed in 2N sulfuric acid, sufficiently washed with ion exchange water, further dried at room temperature, and then peeled off from the PET substrate to obtain polymer electrolyte membrane 9.
- the radical resistance was evaluated in the same manner as in Example 1 except that the polymer electrolyte membrane 9 thus obtained was used instead of the polymer electrolyte membrane 1, and the weight change before and after the immersion in the aqueous solution for radical tolerance test was performed. From this, the weight retention rate was determined. As a result, the weight retention rate after the test of the membrane was 45%.
- Table 2 summarizes the results of the chemical stability evaluation tests of the above Examples and Comparative Examples.
- the catalyst sink necessary to produce the membrane-electrode assembly was prepared as follows.
- the obtained mixture was subjected to ultrasonic treatment for 1 hour and then stirred for 5 hours with a stirrer to obtain catalyst ink 1.
- a membrane-electrode assembly 1 was produced.
- the catalyst ink 1 was applied by spraying to a 5. O cm square region at the center of one side of the polymer electrolyte membrane 1 obtained in the same manner as in Example 1. The solvent was removed by drying to form an anode catalyst layer. As calculated from the composition of the anode catalyst layer and the applied weight, 0.60 mg Zm 2 of platinum was placed. Subsequently, the catalyst ink 1 was similarly applied to the other surface to form a force sword catalyst layer in which 0.60 mcm 2 of platinum was arranged, and thus a membrane-one-electrode assembly 1 was obtained.
- a fuel cell was manufactured using a commercially available JAR I standard cell. That is, On both outer sides of the membrane-electrode assembly 1 obtained as described above, a carbon cloth as a gas diffusion layer and a carbon separator having a gas passage groove cut are disposed, and a current collector and an end braid are provided on the outer side.
- the fuel cells 1 having an effective membrane area of 25 cm 2 were assembled by arranging them in order and tightening them with bolts.
- a membrane-one-electrode assembly 4 and a fuel cell were produced in the same manner as in Example 1, except that the polymer electrolyte membrane 3 obtained in the same manner as in Comparative Example 1 was used instead of the polymer electrolyte membrane 1.
- a power generation test was conducted. The value of current density at a voltage of 0. 5 V is, 1. 6 6 A, it was cm 2. This is equivalent to the evaluation of the power generation characteristics of polymer electrolyte membrane 1, and it can be seen that there is no decrease in power generation characteristics due to the addition of condensate 1.
- a large-sized pulse spray catalyst forming device manufactured by Nordson, spray gun type: NCG—FC (CT)
- NCG—FC NCG—FC
- a fuel cell was manufactured using a commercially available JAR I standard cell (manufactured by Japan Automobile Research Institute). That is, in the membrane-electrode assemblies 2 to 4 obtained above, carbon cloth as a gas diffusion layer and a carbon separator with a gas passage groove cut are disposed on both outer sides, and further on the outer side. collector and arranged E down de plate in order, by tightening these with a bolt to assemble a fuel cell 2 chromatic Komaku area 2 5 cm 2.
- the membrane-one electrode assembly was taken out and put into a mixed solution of ethanol water, and subjected to ultrasonic treatment to remove the catalyst layer.
- the polymer electrolyte membrane from which the catalyst layer has been removed is decomposed by amin decomposition to decompose the segment of the block copolymer 1 that does not substantially have an ion exchange group, and the ions in the block copolymer 1 A segment having an exchange group was selectively removed. That is, 4 mg of polymer electrolyte membrane 1 is cut off. Then, 25% methanol solution of tetramethylammonium hydroxide lO / ⁇ L was added thereto and reacted at 100 ° C for 2 hours.
- the weight average molecular weight of the segment having ion exchange groups selectively taken out from the block copolymer 1 contained in the obtained solution was measured.
- GPC was used to measure the weight average molecular weight.
- the weight average molecular weight of the segment having an ion exchange group of the polymer electrolyte membrane 1 before and after the load fluctuation test is obtained in the same manner as described above, and the weight average molecular weight maintenance rate (%: weight average molecular weight after test / before test)
- the weight average molecular weight XI 00) was calculated.
- the analysis conditions for GPC are as follows.
- a fuel cell 3 was obtained by conducting the same experiment as in Example 7 except that the polymer electrolyte membrane 1 was replaced with the polymer electrolyte membrane 9 used in Comparative Example 4, and the voltage maintenance ratio for this fuel cell 3 was obtained.
- Table 3 shows the results of the weight average molecular weight retention rate.
- the polymer electrolyte membrane obtained from the polymer electrolyte composition containing the component (B) condensate and the component (A) polymer electrolyte membrane is the ion exchange group in the start / stop test of the fuel cell. It was found that the segment weight ratio of the segmented cocoons having a high weight molecular weight is high, and the power generation characteristics over time can be sufficiently suppressed. From the above results, it was found that a condensate of phenols and aldehyde compounds (component (B)) was a polymer electrolyte (a polymer having segments having ion-exchange groups and segments having substantially no ion-exchange groups.
- a fuel cell member such as a polymer electrolyte membrane obtained from the polymer electrolyte composition of the present invention is extremely excellent in radical resistance against peroxides and radicals generated by operation of the fuel cell. It has a practically sufficient power generation performance, excellent long-term stability, and extends the life of the fuel cell.
- the polymer electrolyte composition of the present invention it is possible to obtain a fuel cell member such as a polymer electrolyte membrane excellent in radial resistance while maintaining sufficient power generation characteristics.
- the polymer electrolyte membrane comprising the polymer electrolyte composition of the present invention can provide a fuel cell with excellent long-term stability while maintaining practically sufficient power generation performance, and thus is extremely useful in industry. is there.
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electrochemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Fuel Cell (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/678,666 US20100209810A1 (en) | 2007-09-20 | 2008-09-22 | Polymer electrolyte composition |
EP08831805A EP2192597A4 (en) | 2007-09-20 | 2008-09-22 | POLYMER ELECTROLYTE COMPOSITION |
CN200880108297A CN101802932A (zh) | 2007-09-20 | 2008-09-22 | 高分子电解质组合物 |
Applications Claiming Priority (2)
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JP2007-243630 | 2007-09-20 | ||
JP2007243630 | 2007-09-20 |
Publications (1)
Publication Number | Publication Date |
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WO2009038239A1 true WO2009038239A1 (ja) | 2009-03-26 |
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Family Applications (1)
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PCT/JP2008/067594 WO2009038239A1 (ja) | 2007-09-20 | 2008-09-22 | 高分子電解質組成物 |
Country Status (6)
Country | Link |
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US (1) | US20100209810A1 (ja) |
EP (1) | EP2192597A4 (ja) |
JP (1) | JP2009091568A (ja) |
KR (1) | KR20100057853A (ja) |
CN (1) | CN101802932A (ja) |
WO (1) | WO2009038239A1 (ja) |
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JP6245752B2 (ja) * | 2013-03-26 | 2017-12-13 | 田岡化学工業株式会社 | 共縮合物及びその製造方法、並びに共縮合物を含有するゴム組成物 |
EP3058005B1 (en) | 2013-10-17 | 2023-06-07 | SI Group, Inc. | In-situ alkylphenol-aldehyde resins |
CN105705541B (zh) | 2013-10-17 | 2018-08-24 | Si集团有限公司 | 通过水杨酸稳定的改性烷基苯酚-醛树脂 |
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2008
- 2008-09-18 JP JP2008239220A patent/JP2009091568A/ja active Pending
- 2008-09-22 EP EP08831805A patent/EP2192597A4/en not_active Withdrawn
- 2008-09-22 CN CN200880108297A patent/CN101802932A/zh active Pending
- 2008-09-22 KR KR1020107005887A patent/KR20100057853A/ko not_active Application Discontinuation
- 2008-09-22 US US12/678,666 patent/US20100209810A1/en not_active Abandoned
- 2008-09-22 WO PCT/JP2008/067594 patent/WO2009038239A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
JP2009091568A (ja) | 2009-04-30 |
CN101802932A (zh) | 2010-08-11 |
EP2192597A1 (en) | 2010-06-02 |
US20100209810A1 (en) | 2010-08-19 |
KR20100057853A (ko) | 2010-06-01 |
EP2192597A4 (en) | 2012-01-18 |
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